Mercer County, NJ Property Taxes (2026)

Mercer County owners pay a median of $8,804 a year on a median home value of $351,000, an effective rate of 2.51%. That's the 5th-highest rate of 21 New Jersey counties with Census data, above the New Jersey county median of 2.20%.

Updated October 2026 · Data: U.S. Census Bureau, American Community Survey 5-Year Estimates (2019–2023)

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Effective tax rate

2.51%

5th highest of 21 in NJ

Median annual bill

$8,804

~$734/month

Median home value

$351,000

New Jersey county median

2.20%

Effective rate

What a protest could save you in Mercer County

Enter the market value from your appraisal notice. We apply Mercer County's 2.51% effective rate and a 10–15% reduction, the typical range for successful protests.

$
Est. annual tax
$8,810
Savings at 10–15% off
$881–$1,322
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Mercer County vs. New Jersey vs. U.S. property tax rates

Mercer County2.51%
New Jersey county median2.20%
U.S. county median0.84%

Key stat: Mercer County's effective property tax rate is 2.51%, vs. 2.20% for the median New Jersey county and 0.84% for the median U.S. county. It ranks 5th of 21 in New Jersey. Effective rate = median tax bill ÷ median home value, so it already reflects typical exemptions. (Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2019–2023))

How to appeal your property taxes in Mercer County

  1. 1

    Review your assessment notice

    Check the assessed value from the Mercer County Tax Board. Compare it to recent sales of similar homes nearby.

  2. 2

    File your appeal before the deadline

    The Mercer County deadline is April 1 or May 1. Missing it means waiting until the next assessment year.

  3. 3

    Gather evidence

    Recent comparable sales, photos of condition issues, repair estimates or an independent appraisal.

  4. 4

    Present your case

    Submit evidence or attend a hearing with the County Tax Board.

  5. 5

    Get your decision

    If you win, your assessed value and bill go down. On a $8,804 bill, 10–15% off is $880–$1321 a year.

Mercer County property tax appeal guide →

Want help with it?

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Property tax exemptions in New Jersey

New Jersey homeowners may qualify for exemptions that reduce taxable value. Check with the Mercer County Tax Board for amounts.

Homestead exemption

For your primary residence. Reduces the value used to calculate your bill.

Senior / over-65

Many states add an exemption or freeze for owners 65 and older.

Disability

For homeowners with qualifying disabilities, often similar to the over-65 benefit.

Veterans

Disabled veterans may get partial or full exemptions depending on rating.

Frequently Asked Questions

What is the property tax rate in Mercer County, New Jersey?
The median effective property tax rate in Mercer County is 2.51%: a median annual bill of $8,804 on a median home value of $351,000. That's the 5th-highest rate of 21 New Jersey counties with Census data. Your own rate depends on which city, school district and special districts you're in. Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2019–2023).
How much are property taxes in Mercer County?
The median Mercer County property tax bill is $8,804 a year, about $734 a month, compared with a New Jersey county median of $8,804.
What is the deadline to appeal property taxes in Mercer County?
The deadline to appeal in Mercer County is April 1 or May 1. Missing it means waiting until the next assessment cycle.
Is Mercer County a high property tax area?
Mercer County's 2.51% effective rate is above the New Jersey county median of 2.20% and above the U.S. county median of 0.84%. That's the 5th-highest rate of 21 New Jersey counties with Census data.
Can TaxDrop help lower my Mercer County property taxes?
TaxDrop analyzes your property against local comparable sales and helps you appeal your assessment. See www.taxdrop.com/property-tax-appeal-pricing for current pricing.

Property taxes in nearby counties

Middlesex County

Rate: 2.20%

Median bill: $9,684

Somerset County

Rate: 1.91%

Median bill: $10,001

Hunterdon County

Rate: 2.01%

Median bill: $10,001

Burlington County

Rate: 2.42%

Median bill: $7,902

Monmouth County

Rate: 1.77%

Median bill: $10,001

Union County

Rate: 2.05%

Median bill: $10,001

Camden County

Rate: 3.08%

Median bill: $8,063

Ocean County

Rate: 1.77%

Median bill: $6,499

← All 21 New Jersey counties

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